SDK must report SIP 404 errors to the application on media connectivity issues

[marca56]

SDK must report SIP 404 errors to the application and also report to the application if there is media connectivity issues and the call is cut because of that

[atsakiridis]

Most probably an App issue, not SDK. Hence moving to https://app.zenhub.com/workspace/o/restcomm/olympus/issues/137